human nature and relationships. Yoon would later work again with mostly the same crew in the 2-episode TV special Several Questions That Make Us Happy. Goodbye Solo'''s writer Noh and veteran actress Bae Jong-ok introduced Yoon to Join Together Society (JTS), a Seoul-based Buddhist international relief agency (Yoon herself is a Buddhist). Since then she has been extremely active in charity work for JTS, spearheading street fund drives and various programs to benefit underprivileged children in North Korea and developing countries. An athlete in junior high, Yoon was a Sports Model major at Dongduk Women's University, but eventually dropped out due to showbiz commitments. She later enrolled in Dongguk University as a Theatre and Film major, slowing down her acting activities to focus on her studies and becoming known in the Korean press as one of the very few celebrity model students, with regular attendance and good grades. Yoon graduated in 2011. Her next project Auction House attempted a different format from the standard serialized Korean drama. The twelve-episode first season in 2007 had four directors and four writers, airing one episode every week, with each director producing his own segment in his own style, crossing genres. The episodic format was not a hit with Korean audiences (despite a second season focusing on plastic surgeons with a completely different cast). Yoon then played a former reporter struggling to adjust to life as a chaebol daughter-in-law in Glass Castle; the drama was a modest success in 2008. She was cast as a last-minute replacement leading lady in 2009 in the quirky Lee Joon-gi-starrer Hero.Wee, Geun-woo (November 17, 2009). "Lee Jun-ki says Hero is the perfect fit". 10Asia. Despite being praised as a well-acted and solid drama, Hero received low ratings. Yoon returned to the big screen in Try to Remember, about lovers in the past whose love transcends time and brings them together in the present day, premiered at the 2010 Puchon International Fantastic Film Festival. She was cast as Queen Seondeok in a specially commissioned 20-minute film for the 2011 Gyeongju World Culture Expo. Titled Byeongnucheon ("The Bracelet of Blue Tears"), the fantasy adventure aimed to spearhead Korea's nascent stereoscopic film industry, combining live action sequences with 3D animated computer graphics. Later that year, Yoon's period drama Warrior Baek Dong-soo brought in high viewership ratings, topping its timeslot for 3 straight months. She immediately followed that with the Channel A